Hi,
there is a way to solve the problem, even if it is a bit awkward. First you have to create an empty Joomla module. In this module, you call up the corresponding balbooa gallery, for example with the following input: [gallery ID=2 category ID=51]. In a second step, go to the corresponding Zero app and open the single post layout. There you create a field of the type text. If you now edit the post, the previously created module is called up in this text field, for example with the string: {loadmoduleid 100}.
It's a bit complex, but helpful.
All best,
Florian